161501565 has 8 divisors (see below), whose sum is σ = 258402528. Its totient is φ = 86134160.

The previous prime is 161501533. The next prime is 161501567. The reversal of 161501565 is 565105161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161501565 - 2⁵ = 161501533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161501567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5383371 + ... + 5383400.

It is an arithmetic number, because the mean of its divisors is an integer number (32300316).

Almost surely, 2^161501565 is an apocalyptic number.

161501565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161501565 is a deficient number, since it is larger than the sum of its proper divisors (96900963).

161501565 is a wasteful number, since it uses less digits than its factorization.

161501565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10766779.

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 161501565 is about 12708.3266010911. The cubic root of 161501565 is about 544.5765192174.

The spelling of 161501565 in words is "one hundred sixty-one million, five hundred one thousand, five hundred sixty-five".